Welcome to the AF!
One thing you can do is live with this problem until it gets worse. Then you can effectively troubleshoot it and hopefully determine what part is out of specs.
Since you probably don't want to wait to troubleshoot this intermittent problem, about all you can do is replace parts (cheapest or most likely first) and see if it solves the problem.
First check and clean the all connections (both ends) between the ECM and the ignitor, and sensors (particularly, the crankshaft position sensor).
Check and clean all the connections on the distributor (if you have one).
Check and clean all the connections on the ignitor.
To clean, use a residue-free high-quality electronic connection cleaner.
You can try using the procedure outlined in:
http://www.automotiveforums.com/vbul...d.php?t=217128
for testing components, but your problem sounds like it is non-existant until it kills your car.
In replacing parts, the order I'd replace them is:
1. Crankshaft position sensor
2. ignitor
3. distributor housing assembly
4. ECM
I'm probably missing something, but that's all I can think of.